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Exam 22: Regulated Power Supplies Key

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Question 21

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Thermal shutdown means an IC regulator will shut itself off when the internal temperature drops below a certain level.

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Question 22

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To protect against an accidental short,a series regulator usually includes

A) short-circuit protection.
B) a slow-blow fuse.
C) some form of current limiting.
D) a varistor.

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Question 23

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With the shunt type linear regulator,the regulating device is in series with the load.

What is the term that means each circuit board has its own three-terminal regulator to supply the voltage used by components on that circuit board?

A switching regulator can hold the output voltage constant under varying line and load conditions by

The two types of linear regulators are the shunt type and the series type.

A simple voltage regulator can be built with a zener diode.

The headroom voltage is defined as the difference between the input and output voltage.

By using a voltage regulator between the power supply and the load,line and load regulation can be improved significantly.

Dc-to dc converters have efficiencies that range from

How does using an outboard transistor affect the efficiency of a series regulator?

A switching regulator is the most efficient of all voltage regulators with full-load efficiency from about 75 to more than 95 percent.

Dc-to-dc converters are usually called

Load regulation indicates how much the line voltage changes when the load changes.

The term that expresses how much the load voltage changes when the load current changes is the

A zener diode is what type regulator?

An advantage of shunt regulators is that they have built-in short-circuit protection.

Current-sensing resistors used in series regulator circuits are typically

Which of the following is the most efficient voltage regulator?

What is the term used to indicate that a chip turns itself off when the internal temperature becomes too high?